Pipe-bending die.



Pzztened Jan. 11,

2 SHEETS-SHEET I.

C. H. TRUE.

PIPE BENDING DIE.

APPLICATION .FILED AUGJ, I9I4.

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CHARLES H. TRUE, OF HARIMMOND, NIDLEAN CGMPANY, 0F NEW YORK, N.

A, ASSGNQEL TO LOCOMOTIVE SUPERHEATER A CORPORATIN 0F DELAVTRE.

PIPE-BENDING DIE.

Specification of Lettersetent.

Patented Jan, il, 19nd.,

Application iletl August l, 1914. Serial No. 954,428.

To all whom it may concern.'

Be it known that l, CHARLES H. TRUE, a citizen of the United States,residing at Hammond, county of Lake, State of lndiana, have inventedcertain new and useful Improvements' in Pipe-Bending Dies, of

which the following is a specication.

lily invention relates to a pipe bending die and has for its object toprovide an improved adjustable die by means of Which bends of anydesired angle and radius may be placed in a length' of pipe.

More particularly, the object of my invention is to provide a die of thecharacter described by means of Which the location of the bend, withrespect to its distance 'from the end of the pipe, may be definitelypredetermined by a suitable preadjustinent of the die and so thatthereafter, for a given number of pipe lengths, this determined locationof the bend may be the same for cach.

A still further object. of my invention is to provide a die of thecharacter described so arranged. that, once adjusted for a givenlocation of the* bend, a pipe may be easily and quickly gripped, bentand released with out the possibility of error in the position of thebend.

Another object of my invention is to provide4 a die of the characterdescribed so that the position oi' the bend With referencek to the endof the pipe may be quickly and posi-v tively changed by a definiteamount.

My invention will be found particularly useful in connection withsuperheater ele ments for the flue tube type of superheater, in mostknown forms of which said elements must be bent as they emerge irom theflue tubes and proceed to the smokebox.

Generally speaking. the total number of elements for the superlfieaterof a given locomotive may be separated into four or vc groups accordingto the distance from the end of the elements at which thebend islocated. The improved die of my invention enables all of these bends forthe several groups to be accuratelv and quiclilv made.

ln the accompanying drawings, which form a part of my specification, Ihave shown my invention as applied to a pipe bending machine of thecharacter shown in pipe and the side ot' the the patent to Lassiter Feb.i, i913.

My invention will be better understood by referring to the drawings inWhichl lf'igure l. represents a plan view, part section, of my improvedpipe bendii'ig die; lig. 2 represents a. section, part elevation, alongthe line 2-2 of Fig. l; Fig. i3 represents aA plan View, partly tionthrough the die and ing the position of the has been bent through 900;and l A, plan view, part section, similar to showing the pipe inposition for a different distance from its end.

in the drawings, the bed or frame l of the bending machine, the spindle2 f having no function when my revolubly mounted hollow shaft 3 keyed tothe die at 4, the bending rolle attached to frame (i which itsell3engaged with guide rails C so rocatcd toward and from the rod 8 of aircylinder 9, are all parts or" the Lassiter machine as shown in the abovereferred to patent. l

.The die or former .l0 which, as stated above, is keyed to shaft 3, atsi, has the form of an elongated plate fith the end, 1]., ad-

NO. 1,052,069 dated guide rollers, showparts atte bending at is slidablyas to be recipin horizontal secimproved die is used), the' s 5revolubly' the*4 pipe 4 die by piston'- jacent to the shaft, curved' tosuch radius as it is desired to bendV the peripherally grooved diameterof the pipe. die are parallel to one another and provided withdovetailed grooves in which are slidam bly litted a cam member l2 and ajaw rneinber 13. This jaw member i3 is recessed to contorni to the headle (the end as shaped to be attached to the steam collector) of the dieinto which the Liaw member dovetails is located at such distance fromthe center line of the die that when the pine le is tangent to and incontact With the peripheral groove of the die, the head lwill litaccurately'into the recess of said jaw member. Y

The bodv ol die l0 has a horizontal slot 15 extending Jfrom a point nearthe hollow shaft 3 toa point near the end of the die and in this slotlies a `transverse clamp operating shaft 1G one end of which has an easyrotating and sliding it lin a hole l boren"l pipe upon and in conformitywith the Opposite sides of the bery 18.

The sleeve like outer end loi. cam member 12 is provided with a pair oi'oppositely ar ranged and'similarljvf disposed notches 9.3'

each of which has one straight face and one concave face whichconstitutes a cam surface. A transverse riding bar 2o' having projectingends, passes diametrically through shaft 16 adjacent to cani member liliand is held in position by the collar 2 l itself held 'from slippingoli) by the nut il?.

A spring;` E28 surrounds shaft 1 and held between the inner silemoi cammember 1Q and collar 29 hired to said shaft..

The length of shaft 1G is such that, when vclamp member 1S is drawnagainst aw inember 13, the riding bar will just elear the end of cammember 1&2 and when the riding bar is at the bottom oi' notches 22%clamp member 18 will. be sutliciently distant 'from the jaw member 13 topermitl the end 11 oi" pipe 14 to be inserted into the recess of said,jaw member.

An adjusting screw 30 has one end Fixed in the outer end of jaw member153 and passes loosely through a. hole bored in a plate S51 screwed orotherwise fixed to the outer end of die 10. Nuts are threaded upon screw30 upon each side of said plate. By suitably turning said nuts upon theser-ew the jaw member 13, together with shaft 113, cam member 12, clampmen'ib'er 1&5 and clamping lever 20, all iixed thereupon, may beadjusted to and fro in the length of the die so as to vary the positionof the end or head let of pipe 14; when nuts 32 are tightened upon plate31 the position 01' the pipe end will be fixed until the describedadjusln'ient is changed.

The operation oi? my invention is as fob lows: The several parts of themechanism being in the position shoivn in Figs. 1 and 2, the pipe 1l isplaced in the peripheral groove of die 10 with its previously shaped -vend or head 14 in the recess ot' clamp meinber 13. Clamping lever 2O isthen drawn outward and downward, thereby rotating shaft 16 and causingthe riding har to rise on the concave cam 'face 21 oi cam member 12',thereby compressing sprine 28 and drawing clamp member 18 toward the jawmein berlB. As the clamping lever reaches its losvermost position theriding bar .25 will slip out ot' .the notches 23 and lie upon the dat:mentes outer face olf' cam member 1Q and the clamp member 13 will bedrawn against the javi' meinba 13 and hold the pipe end 1e iirmly inposition.' "lf he bending rollers 5 are then in ved inwardly by theadmission of air to air cylinder 9 and the die 10 is revolved,

counter cloele-Wise, to the position shown in Fig. 3 thereby producing aright angle bend in the pipe. revolving the die through a lesser orgreaterangle the angle ot bend will be correspondingly changed.

The bending operatioznas above described, is that of the Lassiter patentpreviously re- -lierred to and l claim no part of the saine as myinventionother than that which has to do withv the clamping et the pipeend. Should itbe desirable to produce a bend in pipe 1st at a great-eror less distance 'from the end of the pipe, the nuts 32 are loosened andthe screww 30 rotated in one direction er the other, thereby sliding theadjustable porn tion et the die in or out as the ease may be. The nuts32 are tightened o' 'when the desired positionfor he pipe end has beenobtained. The operations as just above described are then performed. fi;shows the adjustable part of the die set for a distance l'ietvveenpipeend and bead greater than that shown in Figs. l, 2 and llhen the bendhas been completed the bendn ing rollers are withdrawn., the clampinglever 20 thrown, upwardly and inwardly,

-thereby permitting the riding bar 25 to drop into the bottoin o'l thenotches and spring 28 to move'clamp member 18 avvay from the jaw member.rlhs pipe is then removed.

lllhile l. have shown the die ol' my invention as applied to a LassiterbendinI chine as disclosed in the previously referred to patent, Al'. donot limit myself to such use as obviously my die may be adapted to va-Arions mechanisms Awithin the spirit oit the invention. Essentially allthat is required to use said die is that there be bending rollers or thequivalent adapted to be place-l against the pipe and that the 'euponsaid bending rollers and die be arranged to move relativelyT to the axisof the peripheral groove. Furthermore, While l have shown my die asapplied to a pipe it is obvious that strips, channel bars, and otherlinear struetures may be usefully bent therein.

Having described my invention l claim:

ln a pipe bending die of the class dcscribed and adapted to be revolvedabout an axis, means for holding the end of 'the pipe said meanscomprising a jaw member and a notched :am member slidably engaged with'the die, a clamp operating shaft passingr slidably` and rotatablythrough said jaw and cam members, a clamp member and a riding,f barfixed to said shaft and the length of said shaft being; such ythat whenthe riding bar is iree 'of l notches the clamp and members are eraivntog-ether while when the the plate 31 of the notches r are'sepaz ,e'pipe means 5 engaging both the die and the pipe end holdu lng meanswhereby along the die with r the latter may be moved espect to the axisthereof.

In testimony whereof, have hereunto set my vhand in the presence of twosubscribing Witnesses. r.

. CHARLES H. TRUE. Witnesses E. @.PATTERVSON, M. S. ROUSMANIERE.

